These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
The Russian President is taking a chance by intervening in a bloody civil war in Syria, but his gamble is a calculated one. You have to give Vladimir Putin creditâhe has a special talent for changing facts on the ground and daring others to do something about it.